Geologic units in Pickens county, South Carolina

Additional scientific data in this geographic area

Migmatitic granitoid gneiss (Ordovician) at surface, covers 45 % of this area

Variably foliated, variably migmatitic, and granitic to quartz dioritic in composition

Biotite-plagioclase-quartz gneiss and biotite-muscovite schist (Cambrian or Neoproterozoic) at surface, covers 30 % of this area

Variably interlayered, containing subordinate layers of amphibolite and sillimanite-mica schist

Granite gneiss (Silurian to Ordovician) at surface, covers 7 % of this area

Equigranular to inequigranular granite gneiss and augen gneiss, undivided

Wallhalla metamorphic suite (Cambrian or Neoproterozoic) at surface, covers 7 % of this area

Predominately hornblende-plagioclase gneiss and amphibolite, locally having interlayers of biotite-quartz-feldspar gneiss, undivided

Garnetiferous mica schist (Cambrian or Neoproterozoic) at surface, covers 4 % of this area

Aluminous muscovite-biotite schist, locally having subordinate amphibolite layers

Henderson Gneiss (Cambrian) at surface, covers 4 % of this area

Biotite granitoid augen gneiss having distinctive microcline augen; monzonite to granodiorite composition

Chauga River Formation and Poor Mountain Formation, undivided (Cambrian or Neoproterozoic) at surface, covers 3 % of this area

Chauga River Formation and Poor Mountain Formation, undivided

Henderson Gneiss (Cambrian) at surface, covers < 0.1 % of this area

Monzonitic to granodioritic; inequigranular.

Sillimanite schist and sillimanite-mica schist (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Sillimanite-rich aluminous schist composed mainly of sillimanite, biotite, muscovite, and minor quartz